Design And Analysis Of Aero-engine's Variable Geometry Chevron On FG-SMA

The jets of aero-engines make a strong noise during take-off and landing,which poses a great health hazard to the airport staff and surrounding residents.In recent years,variable geometry chevron(VGC)has been applied to aero-engine external culverts to reduce jet noise.In order to overcome its susceptibility to bolt slack and shedding during recycling,this paper intends to present a gradient in thickness proportionally distributed functionally graded shape memory alloy(FG-SMA)is used in the design of aeroengine variable geometry chevron.The functionally graded VGC gear device is a composition of glass fiber composite board substrate and shape memory alloy material deformation.The engine model used in this article is Trent 1000,in which the number of VGC is 14.First of all,the SMA laminate is subjected to different layers(2 layers,4 layers,6 layers,8 layers,10 layers)and different SMA component contents(10%,20%,30%,40%,50%,60 %,70%,80%,90%)and different gradient gradient ratios(1: 1: 1: 1,3:1: 1: 3,5: 1: 1: 5).According to different design schemes,the finite element modeling of the aero-engine variable geometry chevron device is performed by using the glass fiber and shape memory alloy material property tables.The stress,tip deflection and strain of the device under temperature load are simulated and analyzed.Finally,combined with orthogonal analysis,discuss the influence of different design factors on the mechanical properties of variable geometry chevron.It should apply 14 VGC to the aeroengine external duct tail nozzle,discuss the tip deflection,stress and strain of the whole variable geometry chevron with different gradient ratios(1:1:1:1,3:1:1:3)under the temperature load.It should also compare the thermodynamic properties of the stress,tip deflection and strain of the single VGC and the overall VGC at the same gradient ratio.It provides a material design idea and theoretical basis for obtaining the optimal tip deflection value in the future.